Revert of Devtools UI: Update inspect element node description label UI

Revert of Devtools UI: Update inspect element node description label UI (patchset #6 id:100001 of https://codereview.chromium.org/1255573004/)

Reason for revert:
Tried it, regresses my experience, will post more into the bug.

Original issue's description:
> Devtools UI: Update inspect element node description label UI
> 
> This change updates the node description label to match updated tooltip
> UI. These labels have the following characteristics:
> - Default to above the anchor element
> - Centered above the anchor element
> - Clamped to the visible viewport (no change)
> - Non monospace font to improve text readibility
> - Removal of "px" in dimensions
> 
> BUG=513066
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=199732

TBR=dgozman@chromium.org,maxwalker@chromium.org,paulirish@chromium.org,sergeyv@chromium.org,samli@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=513066
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=199759

[pfeldman, 2015-07-30 21:53:40]

Created Revert of Devtools UI: Update inspect element node description label UI

[commit-bot: I haz the power, 2015-07-30 21:54:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1259413003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1259413003/1

[commit-bot: I haz the power, 2015-07-30 21:54:59]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=199759